A Mold Culture in a Dorm Refrigerator Is Circular and Growing

question 21

Multiple Choice

A mold culture in a dorm refrigerator is circular and growing. The radius is increasing at a rate of 0.4 cm/day. How fast is the area growing when the culture is 3 centimeters in radius? (The area of a disc of radius r is .)

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Definitions:

Murmur Auscultated

The sound heard through a stethoscope that indicates the turbulent flow of blood in the heart or great vessels.

Venous Hum

A continuous, low-pitched sound heard over the major veins, particularly in the neck, due to turbulent blood flow.

Murmur

Abnormal heart sounds during a heartbeat cycle, which can indicate various heart conditions.

Carotid Artery

A major blood vessel in the neck that supplies blood to the brain, neck, and face.